Erin I agree with you wholeheartedly. Too much emphasis is put on biology as the reason why there is an "inherent" difference between men and women and nothing is mentioned about the social norms that we all have grown up with that enforce certain notions about men and women.
It's unfortunate that this kind of sexism is so prevalent in society that we barely seem to recognize it anymore, and that we have just begun to associate everything with biology, as if it is a given. I disapprove too.